REXROTH REXROTH optical fiber sensor principle and characteristics
REXROTH REXROTH optical fiber sensor is a kind of transform the state of an object to be tested for measurable optical signal of the sensor.
REXROTH REXROTH optical fiber sensor is to light the incident beam through the optical fiber to the modulator, the modulator in the measured parameters of the interaction with the outside world, to make the optical properties of the light as the light intensity, wavelength, frequency, phase, polarization, such as change, become the light of the modulated signal, through the optical fiber into the photoelectric devices, after demodulator for the parameter being measured. The whole process, the beam of light through fiber imported, through the modulator after injection, in which the role of the optical fiber is first transfer beam, the second is have the effect of light modulator.
compared with traditional sensors, REXROTH REXROTH fiber optic sensor has a unique advantage:
( 1) High sensitivity
because the light is a kind of very short wavelength electromagnetic wave, is obtained by optical phase and its optical length. Fiber optic interferometer, for example, due to the use of optical fiber diameter is small, the role of external mechanical forces or by small temperature changes the optical length will change, leading to larger phase change.
assumption in 1 0 m fiber optic equipment, l changes cause the phase change of ard 1000 ℃, if can detect small phase change is zero. 01 ard, so can measure small temperature change for l 0 ℃, its sensitivity is high.
( 2) Electromagnetic interference resistance, electric insulation, corrosion resistance, intrinsically safe
due to the optical fiber sensor is to transmit information, using light and fiber optic and electrical insulation, corrosion resistance of the transmission medium, and safe and reliable, which makes it can be effectively used in a variety of large mechanical and electrical, petroleum chemical industry, mine and other harsh environments, such as strong electromagnetic interference and flammable and explosive.
( 3) Measurement speed
the transmission of light speed and the two-dimensional information can be transmitted, thus can be used for high speed measurement. On the analysis of radar signals, such as requirement has a very high detection rate, applied electronics method is difficult to achieve, using the phenomenon of light diffraction spectrum analysis can solve at a high speed.
( 4) Large capacity of information
measured signal to light wave as the carrier, and the light of the high frequency, to accommodate the band is very wide, can transmit the same optical multi-channel signals.
( 5) Is suitable for bad environment
fiber is a kind of dielectric, high pressure resistance, corrosion resistance, resistance to electromagnetic interference, and can be used for other sensors do not adapt to bad environment.
in addition, the fiber optic sensor has the advantage of light quality, small volume, also can be crooked, measuring object widely, good reusability and low cost etc.
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